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FIG. 1. 72-year-old woman scanned 3 and 8 hours post ictus.
A, Diffusion-weighted imaging reveals a questionable area of restricted diffusion in the left frontal lobe, not identified prospectively.
B, Perfusion-weighted imaging demonstrates a large region of delayed time-to-peak (hyperintensity) in the left middle cerebral artery territory.
C, Diffusion-weighted imaging at 8 hours shows acute cortical and subcortical infarcts in the left frontal watershed zone.
D, T2-weighted image at 8 hours shows no abnormality.
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